Hong Kong Orchid Trees

Photo
The picture on the right of the Hong Kong Orchid Tree was taken in March. Its flowers are an impressive six inches across and vary in color from burgundy to purple. The flowers have a very faint sweet scent. The leaves on this tree have an interesting double lobbed shape. This orchid tree was planted in October 4 years ago and is in full sun.

Overview
Orchid trees do very well in the lower desert heat but have troubles with the saltiness of the Phoenix area water. Not all varieties of orchid trees are created equal. The less common Hong Kong orchid tree is preferable to the more common Purple orchid tree. Most importantly, the Hong Kong is sterile so it does not produce the messy beans that the Purple does. Also, the Hong Kong has larger flowers and leaves, and a longer flowering period, from January to May. The Hong Kong also has a white smooth trunk rather than the rough black trunk that the Purple has. Orchid trees can become very large, up to 30 feet tall, but can also be kept as a small tree or bush with pruning.

Heat Tolerance and Sun Exposure
Orchid trees do very well in the lower desert heat and sun if they have sufficient water.

Cold Tolerance
Hong Kong Orchid trees are damaged at 27 degrees Fahrenheit. Their leaves, flowers, and small twigs will be killed back at this temperature. However, their larger limbs are a couple of degrees more hardy. Also, they will come back from their roots unless the ground freezes, which never happens in the Arizona desert.

Planting
Dig a hole at least twice the size of the rootball. At a minimum, make the hole 2 feet in diameter and 2 feet deep. Back fill the whole with the same native soil that was removed. It also is a good idea to finish with the hole an inch or two recessed so that a watering basin is formed. After planting, spread a thin layer of compost on top of the soil to help conserve moisture and to supply some nutrients.

Watering frequency
Orchid trees do well on a grass watering schedule.

Watering method
Basin or flood irrigation is recommended because it helps keep the salt in our salty water from accumulating around the roots. Furthermore, deep watering will encourage the plant to develop deeper roots, making the plant tougher when the weather gets hot and dry.

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